Virgil w



(NoModel.) V. W. BLANCHARD. FURMGB WALL.

10.413,905. l Patented 001;. 29, 1889.

Pof-'au sf: ra rial/ esta a).

N. PUERB. Phdblihufrapher, Waillington. D. (AI.

NITED STATES PATENT OFFICE.

vIReiL w. BLANCHARD, or NEw YORK, N. Y.,- AsSieNoR rro JosEPH A.

' DAVIS, or SAME PLAGE.

FURNACi-WALL.

SPECIFICATION forming part of Letters Patent No. 413,905, dated October29, 1889.

Application filed Aprl9,1889, Serial No. 306,534. (No modelo' To allwhom it may oaceia.- v j Be it known that I, VIRGIL W. BLANCHARD, of NewYork, in the county of New York and State of New York, have inventedcertain new and useful Improvements in FurnaceWalls; and Ido herebydeclare that the following is a full, clear, and 'exact descriptionthereof, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form part of thisspecication,

' in which#- ,raised to a state of incandescence.

Figure 1 isa vertical section showing a furnace-lining which isconstructed according to my invention, having asbestus paper and porousfirebrick interposed between the lining of the furnace and an outermetal jacket. Fig. 2 shows pulverized material on each side of a porousfre-brick, an outer metallic jacket, and an internal re-brick wall.

This invention yis designed for preventing undue radiation of heat fromfurnacewalls; and the nature of my invention consists in a heat nonconducting wall which is constructed zas will be fully understood fromthe following description, when taken in connec-v tion with the annexeddrawings.

The non-conducting wall whichI am about to describe is designedvespecially for such furnaces as aresubjected to a very high degree ofheat wherein the internal walls are To prevent the radiation of heatfrom these walls, I construct the internal-wall A of dense firebrickswhich have been subjected to the highest possible degree of heat intheir manufacture. Now it will be observed that I have a stratum betweenthe internal wall A, or wall proper of the furnace, and the outer jacket'of loose material, which of itself is practi# cally indestructible byheat and which allows air to freely circulate through it. Thisnonpulverized flrebrick E, as shown in Fig. 2,

which I deem a fair equivalent for asbestus packing.

-In Fig. l I show a furnace-wall which is composed of the densefire-brick lining A, a stratum D, composed of layers of asbestus paper,a stratum composed of porous firebrick O, another stratum composed oflayers of asbestus paper D', and a metal jacket B. An essential featureof my invention is the employment of porous fire-brick in combinationwith dense `fire-brick and asbestus paper, the porous fire-brick beingmade by mixing straw with clay and burning out the straw in the processof burning the brick, thereby leaving air circulating passages in andthrough the bricks.

Having described by invention, I claiml. .A wall for furnaces and otherpurposes, composed of an internallining of dense tirebrick, an externalmetal jacket, and intermediate layers of porous tire-bricks andrefractory substance, substantially as described.

2. A furnacewall composed of dense tirebrick lining, a layer of looserefractory niaterial, a layer of porous lire-brick made asdescribed,another layer of loose refractory material, and a metal jacket,substantially as described.

In testimony that l claim the foregoing as my own I affix my signaturein presence of two witnesses.

VIRGIL XV. BLANCHARD.

Witnesses:

A. E. DowELL, P. L. BRooKs.

